| 摘要 |
A compound having the structure: <IMAGE> wherein R1, R2, R3, R4, and R5 are each independently a hydrogen atom, an alkyl group or an aryl group, or wherein R2 and R3 together and R4 and R5 together are joined as a cycloalkyl group; wherein R6 is a hydroxyl group, an alkoxyl group, an aralkyloxy group, or -OSi (R8 R9 R10) in which R8, R9 and R10 are each independently an alkyl group or a phosphate salt group and R7 is a hydrogen atom, a halogen atom, an alkyl group, or an alkoxyl group.
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